I'm a big fan of the 'OK Google' movement on my Nexus 5, and I can't wait to get my hands on Glass, but now there's a Chrome extension that gives you the same voice command ability with Google Search.
If you have a microphone hooked up to your computer, or alternatively if you're using a notebook/Ultrabook with one built-in, all you have to do is say "OK Google" and a question, and it will look it up for you. The best questions, I've found, are asking it about the weather, or time, or a crazy math question.
You can get this all from the Chrome Store, by downloading the extension and trying it out. Do let us know how your travels are with the extension!